Rock-drill.



PATENTED AUG. 18, 1908.

. SMITE'.

RCK DRILL.

APPLICATION FILED PERM, moa.

,2 SHEETS-SHEET-L Arron/vens.

- PATBNTED AUG. 18, 1908. o. J. SMITH. ROOK DRILL.. APPLICATION FILED PEB. 24, 1908.

v2 SHEETS-SHEET 2` Hmmnunnlllllllll lll nlllll Il" lllllllllllmm UNITED sTArns PA'rnNr orricn CLARK J. SMITI-I, OF OTTUMWA, IOWA, ASSIGNOR TO TI-IE HARDSOGG WONDER DRILL OO., OF OTTUMWA, IOWA.

ROCK-DRILL.

Specification of Letters Patent.

Patented Aug. 18, 1908.

` Application led February 24, 1908. Serial No. 417,474.

To all 'whom Lt may concern:

Be it known that I, CLARK J. SMITH, residing at Ottumwa, in the county of Vapello and State of Iowa, have invented certain new and useful Improvements in Rock- Drills, of which the following is a speciiication.

My invention relates to certain new and useful improvements in rock drills and the like and in its generic nature the invention embodies a removable chuck for rock drills and an improved means for securing the chuck and holder to the drilling engine.

The invention primarily has for its object to provide a means for securing the chuck holder to the drilling engine end whereby a tight 'fit is made and the parts are so arranged and designed as to be readily separated or attached, as desired.

n More specifically my invention resides in coupling the holder to thevdrillingfengine by,

a collar nut having internal threads to engage external threads on the engine and the holder, the threads on the holder being of a different pitch than those on the engine, while the collar threads are formed to correspond to the threads on the holder and on the engine, so that as the collar is'turned in one direction the holder and engine will be tightly drawn together (the engine and holder having a male and female connection) but when the nut is given a slight turn in the opposite direction, the combined threads will serve to quickly part the holder from the engine when the holder may be then readily unscrewed from the nut without removing the nut from the engine.

My inventionalso embodies. the special construction and arrangement of parts hereinafter fully described, and specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which: I

Figure 1, is a perspective view of a drilling engine embodying my invention. Fig. 2, is an enlarged vertical section of my invention showing. the position of the parts when locked together. Fig. .3, is a similar view after the nut has been slightly turned to part the holder from the engine. Fig. 4, is a similar view the holder being unscrewed from the nut.

Figs. 5 and 6, are sections onv the lines 5-5 and 6 6 respectively of Fig. 2. Fig. 7 is an exaggerated detail view of a portion of the coupling nut showing the oppositely pitched threads.

Referring now to the accompanying drawings 'in which like letters and numerals of reference indicate like parts in all of the figures, l designates the drilling engine which may be of any improved type, the front or drill holding end of which is formed with a conical portion l which has a pocket lb to receive the intermediate or special hammer 2 against which the hammer piston 1d of the engine impacts.

The outer surface of the engine barrel is threaded adjacent the conical portion, as at 1C, with a deinite number of threads per inch, say ten threads per inch.

The drill chuck 3 has a head 3 a and a shank 3b to fit in the bore arts '4a and 4b respectively of a chuck holder 4 whose inner portion is provided with a conical recess 4C to receive the conical ortion la of the engine. The outer surface o the holder 4 is threaded at 4d with threads ofa different itch than those lC of the engine, say eight tlireads per inch.

A nut 5 having internally threaded portions 5a-5b unites the holder to the engine, the nut threads a-b corresponding to those 4d and lC of the holder and engine respectively. v

The chuck 3 has a drill receiving bore 3C into which the end of the drill 7 is adapted to be fitted while the intermediate hammer 2 is provided with a passage 2a to permit the eX- haust assing therethrough and through the drill when a hollow drill is used.

By providing the nut with the two sets of threads one of one pitch and the other of another pitch, when the nut is turned backp thus forcing the holder off the cone end of and the drilling engine, of different pitches and direction, and said holder and engine the engine, after which the holder may be unscrewed from the nut and removed.

One of the sets of threads is left handed and the other is right handed so that when the nut is turned in one direction the meinbers 4 and l will be separated and when turned in an opposite direction will be drawn together.

A diiierent chuck may then be placed in the holder and the parts reassembled or a different type of holder and chuck may be substituted, as may be 'found desirable.

One of the principal features of my present invention resides in combining the two dii*- ferent pitches of threads in the same nut for the purpose oi converting a coarser thread into the power of a liner thread.

From the foregoing description taken in connection with the accompanying drawings, it is thought the complete construction, and numerous advantages of my invention will be readily understood by those skilled in the art to which the invention appertains.

What I claim is:

1. The combination with the drilling engine and the chuck holder, of means for coupling the two, said coupling means having a threadedengagement, with the holder andthe drilling engine, ol" different pitches and directions.

2. The combination with the drilling engine and the chuck holder, of means 'for coupling the two, said coupling means having a threaded engagement, with the holder having cooperating conical ortions.

3. ln a drilling engine ,iaving a conical projection at one end, a drill chuck secured to the projecting end of said engine and having a conical portion to cooperate with the conical projection of the engine, said engine and said chuck having threaded portions oll substantially the same diameter, the threaded portion of the drilling engine having a dilferent pitched thread from that of the chuck and a coupling nut having a bore of substantially the same diameter throughout and threaded to cooperate with the chuck and the engine.

4. In a drilling engine having a conical projection at one end, a drill chuck secured to the projecting end of said engine, and having a conical portion to cooperate with the conical projection of the engine, said engine and said chuck having threaded portions ol substantially the saine diameter, the threaded portion of the drilling engine having a dililierent pitched thread -from that of the chuck and a coupling nut having a bore of substantially the same diameter throughout and threaded to cooperate with the chuck and the engine, the threads ol" the chuck being oppositely pitched to those ol: the drilling engine.

CLARK J. SM 1TH. l/Vitnesses:

A. C. JUDD,

RALPH MA1-ION. 

